Towards a cysticercosis-free tropical resort island: A historical overview of taeniasis/cysticercosis in Bali

sutisna, Putu and Kapti, I Nengah and Wandra, Toni and Dharmawan, Nyoman S. and Swastika, Kadek and Sudewi, A.A. Raka and Susilawathi, Ni Made and Sudarmaja, I. Made and Yanagida, Tetsuya and Okamoto, Munehiro and Yoshida, Takahiko and Donadeu, Meritxell and Lightowlers, Marshall W. and Ito, Akira (2018) Towards a cysticercosis-free tropical resort island: A historical overview of taeniasis/cysticercosis in Bali. Acta Tropica.

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Abstract

Taeniasis and cysticercosis are known to be endemic in several Indonesian islands, although relatively little recent epidemiological data are available. As most Indonesian people are Muslims, taeniasis/cysticercosis caused by the pork tapeworm, TAENIA solium, has a restricted presence in non-Muslim societies and is endemic only among some Hindu communities on the island of Bali. Bali has long been known to be endemic for taeniasis/ cysticercosis; almost a century ago levels of cysticercosis of 20–30% were described in cattle and 2–3% in pigs. Few studies of taeniasis/cysticercosis were undertaken in Bali prior to a series of research programs commenced since the 1990s. Both TAENIA SAGINATA and T. solium continue to be endemic in Bali. Molecular studies have revealed that all T. SAGINATA-like tapeworms detected in Bali are T. SAGINATA. No evidence has been found for the presence of TAENIA ASIATICA in Bali. Economic, sanitary and education improvements across much of the island over the past decades have been associated with a decline in the amount of transmission of T. solium such that the parasite now seems to be restricted to the eastern part of the island, a small area on the northeastern slope of Mt. Agung, the highest mountain in Bali. The living environment including sanitation and hygiene condition in this endemic area remains relatively poor especially during the half-year dry season, and pigs continue to roam freely. In this review, historical records and ongoing projects towards elimination of taeniasis/cysticercosis in Bali are reviewed to provide a better understanding of the present situation of taeniasis/cysticercosis in Bali towards a future, cysticercosis-free tropical resort island.

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